Solve using substitution.
y = 8x + 7
y = -8x - 9

(-1,-1)

Step-by-step explanation:

1) since both equations are equal to y, we can substitute the value of "y" in one equation to the value of y in another:

8x+7=-8x-9

combine like terms:

8x+8x=-7-9

16x=-16

x=-1

now substitute "x" as -1

8(-1)+7=-1

hence

x=-1

y=-1

so (-1.-1)

step-by-step explanation:

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